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    <meta charset="UTF-8">
    <title>Title</title>
    <link rel="stylesheet" href="index.css">
    <link rel="stylesheet" href="https://cdn.bootcss.com/twitter-bootstrap/4.3.1/css/bootstrap.min.css">
    <meta name="viewport"
          content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0">
</head>
<body>
<span>我做完作业了 哈哈哈哈</span>
</body>
</html>